157831406409 has 16 divisors (see below), whose sum is σ = 222879765888. Its totient is φ = 99005267712.

The previous prime is 157831406407. The next prime is 157831406423. The reversal of 157831406409 is 904604138751.

It is not a de Polignac number, because 157831406409 - 2¹ = 157831406407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (157831406407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213877 + ... + 601170.

It is an arithmetic number, because the mean of its divisors is an integer number (13929985368).

Almost surely, 2^157831406409 is an apocalyptic number.

It is an amenable number.

157831406409 is a deficient number, since it is larger than the sum of its proper divisors (65048359479).

157831406409 is a wasteful number, since it uses less digits than its factorization.

157831406409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818864.

The product of its (nonzero) digits is 725760, while the sum is 48.

The spelling of 157831406409 in words is "one hundred fifty-seven billion, eight hundred thirty-one million, four hundred six thousand, four hundred nine".